When interpreting this, please also consider the warning [1] by Tedros Adhanom et al. in a letter in The Lancet:

"[I]t is very important to adhere to WHO's recommendation that the BCG vaccine is used for COVID-19 only in randomised controlled trials. (...) [T]he BCG vaccine is already in short supply, and indiscriminate use could jeopardise the supply needed to protect children against tuberculosis in high-risk areas."

[1] https://www.thelancet.com/journals/lancet/article/PIIS0140-6...